Lecture_2 - Adam Interactive Physiology Program 1. Select...

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Adam Interactive Physiology Program 1. Select System Button, then… 2. Select Topic area button, then 3. View Cards indicated  First cell division : In humans, about 24 hours after gamete membranes fuse (plasmogamy) o 2 celled stage Cleavage Rapid cell division No cell growth (Individual cells get smaller and smaller)  Cell divisions are repeated from one to the next (no developmental period)  Blastomeres  (new cells that we are creating through cell divisions) o Get smaller and smaller as we go through the cleavage phase  Fig. 29-3 pg. 625 o Protostomes are characterized by spiral cleavage o Deuterostomes are characterized by radial cleavage  Benefits o Smaller pieces o Better SA/V ratio Side 2 /Side 3 Main way to get materials in and out of the cell—diffusion  Different cleavage patterns : o Determined by amount of yolk 
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This note was uploaded on 04/06/2008 for the course BIOLOGY 102 taught by Professor Ta during the Spring '08 term at Rutgers.

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Lecture_2 - Adam Interactive Physiology Program 1. Select...

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